ZF 4699.803.028 GK20 | OEM Genuine Part

Overview

The ZF 4699.803.028 GK20 is a genuine OEM clutch pack or shift component engineered for heavy-duty construction machinery transmissions. This precision-machined part resides within the hydraulic control assembly of ZF powershift transmissions, where it modulates clutch engagement and disengagement during gear changes. The SKU 4699.803.028 is specifically designed to withstand high cyclic loads and thermal stress in excavators, wheel loaders, and graders. When paired with the 4699101046 HOUSING, it ensures proper alignment of the clutch piston and friction discs. This component directly interacts with the 4699301109 HOUSING to maintain oil flow paths for cooling and lubrication.

Symptoms of Failure

• Delayed gear engagement or clutch slipping – Worn GK20 components cause hesitation when shifting from neutral to drive, especially under load in construction equipment.
• Transmission overheating – Internal leakage past the GK20 reduces hydraulic pressure, generating excess heat during operation.
• Erratic shift quality – Hard or jerky shifts occur when the GK20 fails to hold steady pressure, often accompanied by shuddering on inclines.
• Oil contamination from metallic debris – Flaking or pitting of the GK20 surface introduces fine metal particles into the transmission fluid, visible during oil changes.

Technical Specifications

Compatibility

This genuine ZF GK20 component is compatible with the following transmission models commonly used in construction machinery: ZF WG180, ZF WG200, ZF WG210, and ZF WG250. It also fits select variants of the ZF Ergopower series (e.g., 4WG-200). Always verify your transmission serial number before ordering. The 4699301017 BEARING COVER and 4699301085 COVER are frequently replaced simultaneously to prevent oil bypass.

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